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30 November 2008

The Response of ship in an irregular seaway follows the same statistical laws as do the waves. Records of ship responses show patterns similar to those of wave records. Therefore, instead of having a graph for the square of each component wave component wave amplitude as a function of frequency, one can have a graph of the square of the rolling (or any other motion) amplitude that the particular wave component of that amplitude and frequency would produce. The resulting spectrum known as the response spectrum will give similar statistical properties to those obtained in the case of sea waves. Energy Spectrum method is utilized.

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